Synthesis of Thermochromic Mo-Doped VO₂ Particles

Abstract

Mo-doped vanadium dioxide particles were produced by simple solution-based, rapid microwave assisted, and calcination in an inert gas method respectively. The precursors and the heat-treated final powders were characterized by X-ray diffractometer (XRD), differential scanning calorimeter (DSC), scanning electron microscope (SEM), and transmission electron microscope (TEM). The Mo dopant influenced the crystal structure and phase transition of VO2 (M) particles. The XRD pattern indicated that all Mo-doped VO2 particles were monoclinic crystal. The DSC results showed that phase transformation temperature of VO2 from monoclinic to tetragonal or rutile, which normally occurred at 67-68 oC was reduced to 43.18 oC, whereas over doping of Mo led to the increased transition temperature. The results suggested a significant effect of Mo doping content on the transition temperature of VO2. Doping with an optimum amount of Mo into VO2 structure can achieve the lowest phase transformation temperature of VO2 powders.

New intelligent multifunctional SiO2/VO2 composite films with enhanced infrared light regulation performance, solar modulation capability, and superhydrophobicity

“…Metal ion doping of VO 2 thin films is an effective approach to reduce T C . It mainly involves doping with cations and anions, such as tungsten [ 15,16 ], molybdenum [ 17 ], silicon [ 18 ], fluorine [ 19,20 ], niobium [ 21 ], and lanthanum [ 22 ]. Among these dopants, tungsten is most effective, lowering T C by 20 °C per 1 at% [ 15 ].…”

Orbital electronic occupation effect on metal–insulator transition in Ti x V1−x O2

“…As has been reported, the T MIT of VO 2 can be altered via the cation-doping method. There are two classes of V 1−x M x O 2 doped system: T MIT increases slightly for M = Al 3+ [10], Cr 3+ [11], Fe 3+ [12,13], and Ti 4+ [14][15][16][17][18], while it declines in an obvious manner in M = W 6+ , Mo 6+ [19][20][21][22][23]. Among them, the M 3+ and M 6+ ions replacing V 4+ ions will complexify the system.…”